JPH0690105B2 - Oil leak detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an oil storage system (oil tank) in which fuel oil of a thermal power plant is stored, and an oil feed pipe attached to the oil storage system. The present invention relates to an oil leak detection device that detects an oil leak that occurs in a system or the like.

[Prior Art] Conventionally, for example, an oil storage system A storing fuel oil of a thermal power plant, an oil transmission pipe system B attached to the oil storage system A, etc., as shown in dashi The oil leak is introduced along the guide groove C into the pit E where the oil leak detection device D is arranged to detect the oil leak.

That is, as shown in FIG. 5, the oil leakage detection device D can contact the float F that floats on the water W previously stored in the pit E and the water surface WL, or can be slightly immersed below the water surface. It has a structure with a pair of attached electrodes G1 and G2.

Therefore, as shown in FIG. 5, in the normal state in which no oil leak occurs, both electrodes G1 and G2 are in contact with water W, so the current value based on the electric resistance of water or the capacitance of water is measured. To be detected. When an oil leak occurs from the oil storage system A or the oil transfer piping system B of FIG. 4, the leaked oil is introduced into the pit E through the guide groove C and, as shown in FIG. 6, on the water surface WL. An oil leak layer O is formed on the electrode, and the electrodes G1 and G2 are brought into contact with the oil leak layer O to change the current value or the electrostatic capacity. By measuring this change value, oil leakage occurs. It is configured to detect an emergency condition and issue an alarm.

[Problems to be Solved by the Invention] However, in the above-described conventional oil leak detection device, although not shown, a guide member for holding the float F so as to be able to properly move up and down according to a change in the water surface WL or the oil surface OL. Even if the current value or electrostatic capacity changes due to the depletion of water in the stanchion or the pit E that holds this guide member in a vertical posture, the alarm is distinguished from the change in current value or electrostatic capacity at the time of oil leakage. Since there is a need for water depletion detection means for controlling not to emit and an abnormal water level detection means for detecting an abnormal water level due to inflow of rainwater etc. into the pit E, the structure and electrical control of the device are required. The system will be considerably complicated, leading to higher prices. In addition, since it is necessary to construct the guide groove C, the pit E, etc., the price is further promoted.

Further, when high-viscosity oil leaks from the oil storage system A or the oil supply piping system B, the time for flowing into the pit E from the leaked portion through the guide groove C becomes long, which hinders early detection of oil leak. When the high pour point oil that solidifies into a jelly at room temperature leaks, the guide groove C
The oil has a drawback that it cannot be reliably detected because it solidifies during the flow of the oil and is not introduced into the pit E.

The present invention, in view of the above situation, and in particular, heavy oil and crude oil frequently used as fuel have a characteristic of opaque and attenuate the amount of transmitted light, and the point of oil leakage is a mixer penetration part of an oil storage system, It was made paying attention to the fact that it is specified in the joint part and valve intervening part of the oil supply piping system, and the simplification of the structure and the construction of auxiliary work such as guide grooves and pits are unnecessary and the cost is reduced. Not only is it possible to detect an oil leak optically early and reliably, but also to provide an oil leak detection device that can always exert a highly accurate detection function.

[Means for Solving the Problems] In order to achieve the above object, the oil leak detection device according to the present invention is configured to introduce a leaked oil that leaks and drops from an estimated oil leak location selected from an oil storage system or an oil transmission piping system. A case main body having an upward opening, a light projecting means arranged inside the case main body, and a light radiating light from the light projecting means which is arranged inside the case main body so as to face the light projecting means. The light receiving and detecting means for photoelectrically converting, and the feeding roller and the winding roller arranged inside the case body are hung so as to be able to be fed and wound, and the light receiving means and the light receiving and detecting means are provided between the light emitting means and the light receiving and detecting means. A light-transmissive sheet that is provided at a position corresponding to a portion immediately below the inlet port and that transmits the irradiation light, and an electrical output that is output from the light-reception detection unit corresponding to the amount of transmitted light that passes through the transparent sheet. The transmission at the signal level It is equipped with a judging means for judging the amount of light, and this judging means forms an oil leakage layer on the light-transmissive sheet due to the oil leakage from the inlet on the basis of the amount of transmitted light in normal times, and transmits in an emergency. It is configured to detect the oil leak by judging the attenuation of the light quantity.

[Operation] According to the present invention, by arranging the case main body so that the inlet opening upward thereof is located immediately below the oil leakage estimated position of the oil storage system or the oil transfer piping system, When a leak occurs from the estimated leakage point, the oil leaking from the leaked point is guided into the case body through the inlet and is dropped onto the light-transmissive sheet suspended inside and leaks to the upper surface of the sheet. An oil layer will be formed.

In this way, when the oil leak layer is formed on the upper surface of the light transmissive sheet, the amount of transmitted light that is emitted from the light projecting unit, passes through the light transmissive sheet, and is received by the light receiving detection unit is In other words, the amount of transmitted light before the oil leak occurs is attenuated, and an electrical signal of a level corresponding to the attenuated amount of transmitted light is output to the determination means, and an electrical signal of a level corresponding to the amount of transmitted light in normal times is output. Presence / absence of oil leakage is detected by comparison with the signal. Therefore, even if the oil leaking and dropping from the leaking point is a high-viscosity oil or a high pour point oil that solidifies like a jelly at room temperature, the presence or absence of the leaking oil can be detected quickly and reliably. Further, since the light-transmissive sheet used for detecting such an oil leak is hung so as to be able to be rolled out and wound in the case body, the light-transmissive sheet which is wound up and disposed at a position just below the introduction port. If dust or other foreign matter adheres to the upper surface of the sheet and changes the light transmission performance, a new operation with a predetermined light transmission performance can be performed by a simple operation such as winding the sheet portion through rollers. It is possible to easily replace the oil, so that highly accurate oil leak detection can always be performed.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the principle of the present invention. In the figure, 1 is a light projecting means, 2 is a light receiving detecting means, 3 is a light transmitting sheet, 4 is a judging means, 5 is an alarming means, The light projecting means 1 is composed of a light projector which emits light modulated to a specific frequency, and the light reception detecting means 2 receives only the modulated light emitted from the light projecting means 1 and photoelectrically converts it. It is composed of a sensor and a filter circuit. The light transmissive sheet 3 is composed of, for example, a transparent resin sheet.

With such a configuration, in a normal state where no oil leak occurs, that is, in a state in which an oil leak layer is not formed on the upper surface of the light transmissive sheet 3, the light emitted from the light projecting unit 1 emits light. The light is transmitted through the transparent sheet 3 and is received by the light-reception detecting means 2 as a reference amount of transmitted light, photoelectrically converted therein and input to the determination means 4 as an electrical signal, which is input to the determination means 4 in correspondence with the amount of transmitted light. Based on the signal level, it is judged that there is no oil leakage and the normal condition.

On the other hand, an oil leak occurs from an oil storage system or an oil feeding piping system described later, and the leaked oil drops or drops on the upper surface of the light transmissive sheet 3 and, as shown in FIG. When the oil leak layer 6 is formed on the surface of the oil leak layer 6, the amount of transmitted light that is transmitted from the light projecting means 1 through the light transmissive sheet 3 and is received by the light receiving detection means 2 is determined by the type of oil leak. A low level signal is input from the light receiving detection means 2 to the determination means 4 after being attenuated according to the transparency, and the determination means 4 compares the reference signal level input in the normal state with an oil leak state. It is determined that there is, and a signal is output from this to the alarm means 5 to issue an alarm.

In this way, oil leakage can be detected by receiving the oil leakage on the upper surface of the light transmissive sheet 3 to form the oil leakage layer 6 and determining the attenuation of the transmitted light amount due to the oil leakage layer 6, so that the oil leakage can be detected. Even in the case of oils such as viscous oils and high pour point oils that have hitherto hindered or disabled early detection, leakage can be detected quickly and reliably. In addition, the light projecting means 1 emits light modulated to a specific frequency, and the light receiving detecting means 2 receives only the modulated light emitted from the light projecting means 1 so that other light sources can be received. It is possible to reliably prevent a malfunction caused by receiving the light emitted from the.

FIG. 3 is a schematic cross-sectional view showing an embodiment of the detecting device according to the present invention. The same or corresponding parts as those in FIGS. 1 and 2 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 3, the light projecting means 1, the light receiving detecting means 2 and the light transmissive sheet 3 are respectively arranged inside the case body 7, and an introduction port 7A opened upward is provided at the center of the upper part of the case body 7. Has been formed. The light transmissive sheet 3 is disposed between the light projecting means 1 and the light receiving detecting means 2 and corresponding to the lower side of the inlet 7A. The light-transmissive sheet 3 is hung between the take-up roller 8 and the take-up roller 9 which are arranged inside the case body 7 at a distance from each other, and is taken out from the take-out roller 8. By being wound up by the winding roller 9, the light transmissive sheet 3 arranged at a position corresponding to a portion directly below the introduction port 7A can be arbitrarily replaced.

The case main body 1 is arranged in advance, for example, at an oil leakage estimation position of an oil feed pipe system 11 attached to the oil storage system 10, for example, immediately below a valve V provided in the oil feed pipe system 11. is there.

By arranging in this manner, the light emitted from the light projecting means 1 can be kept in a normal state where no oil leak occurs, that is, in a state where the oil leak layer is not formed on the upper surface of the light transmissive sheet 3. The light is transmitted through the light-transmissive sheet 3 to be received by the light-reception detecting means 2 as a reference amount of transmitted light, photoelectrically converted therein and input to the judging means 4 as an electric signal, and the judging means 4 corresponds to the transmitted light quantity. It is judged from the input signal level that there is no oil leakage in a normal state.

When an oil leak occurs in the interposed portion of the valve V, the leaked oil drops or drops on the upper surface of the light transmissive sheet 3 to form an oil leak layer 6 indicated by an imaginary line on the light transmissive sheet 3. become. Therefore, the oil leak is detected, a signal is output to the alarm means 5 and an alarm is issued for the same reason as described in FIG.

The portion of the light-transmitting sheet 3 where the oil leakage layer 6 is formed is rotated by the winding roller 9 to move the light-transmitting sheet 3 in the direction of the arrow, so that the light-transmitting sheet 3 portion where oil leakage has been detected is detected. Can be taken up by the take-up roller 9 and retracted from the light irradiation path, and a new light-transmissive sheet 3 portion can be arranged at a position corresponding to a portion immediately below the inlet 7A to be in the next oil leak detection state. it can. Further, even when dust or the like is attached to the surface of the light-transmitting sheet 3 portion disposed immediately below the inlet 7A, the winding roller 9 is simply rotated to rotate the inlet 7A. It is possible to easily replace the new light-transmissive sheet 3 portion with the portion corresponding to the immediately lower portion.

Moreover, compared to the conventional detection device, the structure and electrical control system are simpler, and since construction of guide grooves and pits is not required, a significant cost reduction can be achieved, so the oil storage system 10 Alternatively, it can be installed at each of the plurality of oil leakage estimation locations selected from the oil supply piping system 11 without giving an economical burden. Therefore, even if the oil that leaks and falls from the leaking point is a high viscosity oil or a high pour point oil that solidifies like a jelly at room temperature, it can be detected quickly and reliably. Is hindered,
It does not go undetected.

[Advantages of the Invention] As described above, according to the present invention, the case main body is arranged so that the inlet opening upward is located immediately below the estimated oil leakage location in the oil storage system or the oil supply piping system. In addition to simplifying the entire structure including the electrical control system, it is possible to achieve a significant cost reduction by eliminating the need for construction of oil leakage guide grooves and pits. Even if there is a leak oil that leaks from the estimated leak location of the oil storage system or the oil transmission piping system, even if it is a high viscosity oil or a high pour point oil that solidifies like a jelly at room temperature, there is an optical leak oil. Can be detected quickly and reliably. Moreover, since the light-transmitting sheet used for detecting such oil leakage is hung on the case body so as to be able to be drawn out and wound up, the light-transmissive sheet which is drawn out at a position just below the inlet is provided. If dust or other foreign matter adheres to the upper surface of the sheet and changes the light transmission performance, a new operation with a predetermined light transmission performance can be performed by a simple operation such as winding the sheet portion through rollers. It can be easily replaced. Therefore, there is an effect that a highly accurate oil leak detection function can be always exerted without being affected by a disturbance such as adhesion of dust.

[Brief description of drawings]

FIG. 1 is a block diagram showing the principle of the present invention, FIG. 2 is a block diagram showing the formation state of the oil leakage layer, and FIG. 3 is a schematic cross-sectional view showing an embodiment of a detection device according to the present invention. FIG. 4 is a conventional oil leak detection system diagram, FIG. 5 is an explanatory sectional view of a conventional detection device, and FIG. 6 is an explanatory sectional view of the same oil leakage layer formation. DESCRIPTION OF SYMBOLS 1 ... Light projecting means 2 ... Light receiving detecting means 3 ... Light transmissive sheet 4 ... Judging means 6 ... Oil leak layer 7 ... Case body 7A ... Inlet port 8 ... Delivery roller 9 ... Winding roller 10 ... Oil storage system 11 ... Sending Oil piping system

Continuation of the front page (56) Reference JP-A-51-61877 (JP, A) JP-A-63-201546 (JP, A) JP-B-56-2904 (JP, B2) JP-B-56-2902 (JP) , B2)

Claims (1)

[Claims] 1. A case main body having an upward opening of an inlet for leaking oil leaking and dropping from an oil leak estimating location selected from an oil storage system or an oil transmission piping system, and a light projection arranged inside the case main body. Means, a light receiving and detecting means arranged inside the case body so as to face the light projecting means, and receives light emitted from the light projecting means to perform photoelectric conversion, and a delivery roller arranged inside the case body. It is hung so as to be able to be fed out and wound around a take-up roller, and is provided so as to extend just below the introduction port between the light projecting means and the light receiving detection means to transmit the irradiation light. Sheet, and a judging means for judging the transmitted light quantity based on the level of an electrical signal output from the light receiving detection means in correspondence with the transmitted light quantity transmitted through the light transmissive sheet. The amount of transmitted light in normal times An oil characterized in that the oil leak is detected by determining the attenuation of the amount of transmitted light in an emergency when an oil leak layer is formed on the light transmissive sheet by the oil leaked from the introduction port. Leak detection device.